Cathode Plate and Preparation Method Therefor, and Lithium Ion Battery

A cathode plate, comprising:

• a cathode current collector and a cathode film provided on at least one surface of the cathode current collector, wherein a cathode active material of the cathode film comprises a first active material, a second active material and a third active material, the first active material is a medium-nickel low-cobalt or cobalt-free transition metal oxide, the second active material is a high-nickel transition metal oxide, and the third active material is a lithium-containing phosphate having an olivine structure;
• the first active material has a chemical formula of Lia1(Nix1Coy1Mnz1Gb1)O2-c1Dc1;
• wherein 0.8≤a1≤1.2, 0.5≤x1≤0.65, 0≤y1<0.13, 0.23<z1≤0.5, 0≤b1≤0.1, 0≤c1<0.1, x1+y1+z1+b1=1, and G is at least one of Mg, Ca, Ce, Y, Al, Sn, Ti, Zr, W, Sr, La, Ba, Co, Mo, Cr, and B;
• D is at least one of N, F, S, C1, Br, and I;
• the second active material has a chemical formula of Lia2(Nix2Coy2Mnz2Mb2)O2-c2Ec2;
• wherein 0.8≤a2≤1.2, 0.75≤x2<1, 0<y2<0.13, 0<z2≤0.25, 0≤b2≤0.1, 0≤c1≤0.1, x2+y2+z2+b2=1, and M is at least one of Mg, Ca, Ce, Y, Al, Sn, Ti, Zr, W, Sr, La, Ba, Co, Mo, Cr, and B;
• E is at least one of N, F, S, Cl, Br, and I.